120769561 has 4 divisors (see below), whose sum is σ = 131748624. Its totient is φ = 109790500.

The previous prime is 120769531. The next prime is 120769631. The reversal of 120769561 is 165967021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165967021 = 11 ⋅15087911.

It is a cyclic number.

It is not a de Polignac number, because 120769561 - 2⁹ = 120769049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120769561.

It is not an unprimeable number, because it can be changed into a prime (120769511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5489515 + ... + 5489536.

It is an arithmetic number, because the mean of its divisors is an integer number (32937156).

Almost surely, 2^120769561 is an apocalyptic number.

120769561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

120769561 is a deficient number, since it is larger than the sum of its proper divisors (10979063).

120769561 is a wasteful number, since it uses less digits than its factorization.

120769561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10979062.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 120769561 is about 10989.5205081932. The cubic root of 120769561 is about 494.2945581655.

The spelling of 120769561 in words is "one hundred twenty million, seven hundred sixty-nine thousand, five hundred sixty-one".